feat: detect an agent's public IPv4 and IPv6 addresses automatically, manual values still win [CI]

backend/tests/MoShiro.Backend.Tests/AddressTests.cs

@@ -0,0 +1,90 @@
+using System.Net;
+using System.Text.Json.Nodes;
+using MoShiro.TestSupport;
+
+namespace MoShiro.Backend.Tests;
+
+/// <summary>public_host 和 ipv6_host 自动识别：Agent 上报公网地址，手填的优先，可以撤销手填。</summary>
+[Collection("probe-e2e")]
+public sealed class AddressTests
+{
+    private const string V4 = "8.8.4.4";
+    private const string V6 = "2606:4700:4700::1111";
+    private readonly BackendFixture _backend;
+
+    public AddressTests(BackendFixture backend)
+    {
+        _backend = backend;
+    }
+
+    private async Task<JsonNode> AgentAsync(string id) => await _backend.GetJsonAsync(_backend.Admin, "/api/admin/agents/" + id);
+
+    private async Task<JsonNode> PatchAsync(string id, JsonObject body)
+    {
+        using HttpResponseMessage response = await _backend.Admin.PatchAsync("/api/admin/agents/" + id, BackendFixture.Json(body));
+        string text = await response.Content.ReadAsStringAsync();
+        Assert.True(response.IsSuccessStatusCode, text);
+        return JsonNode.Parse(text)!;
+    }
+
+    [Fact]
+    public async Task Hello_FillsPublicHostAndIpv6Host_PrivateAndTemporaryAddressesAreIgnored()
+    {
+        await using AgentSimulator agent = await _backend.ConnectAgentAsync(hello: false);
+        agent.Addresses = ["10.0.0.5", "192.168.1.9", "fd00::1", "fe80::1", V6, V4];
+        await agent.HelloAsync();
+
+        JsonNode view = null!;
+        await BackendFixture.EventuallyAsync(async () => (view = await AgentAsync(agent.NodeId.Value))["ipv6_host"]!.GetValue<string>() == V6);
+        Assert.Equal(V4, view["public_host"]!.GetValue<string>());
+        Assert.True(view["public_host_auto"]!.GetValue<bool>());
+        Assert.True(view["ipv6_host_auto"]!.GetValue<bool>());
+    }
+
+    [Fact]
+    public async Task ManualValues_WinOverAutoDetection_AndCanBeRevokedBackToAuto()
+    {
+        await using AgentSimulator agent = await _backend.ConnectAgentAsync(hello: false);
+        string id = agent.NodeId.Value;
+        agent.Addresses = [V4, V6];
+        await agent.HelloAsync();
+        await BackendFixture.EventuallyAsync(async () => (await AgentAsync(id))["ipv6_host"]!.GetValue<string>() == V6);
+
+        // 手填：标记为手动，之后 Agent 再上报别的地址也不覆盖
+        JsonNode manual = await PatchAsync(id, new JsonObject { ["public_host"] = "agent.example.net", ["ipv6_host"] = "" });
+        Assert.False(manual["public_host_auto"]!.GetValue<bool>());
+        Assert.False(manual["ipv6_host_auto"]!.GetValue<bool>());
+        agent.Addresses = ["1.1.1.1", "2606:4700:4700::1001"];
+        await agent.HelloAsync();
+        await Task.Delay(300);
+        JsonNode kept = await AgentAsync(id);
+        Assert.Equal("agent.example.net", kept["public_host"]!.GetValue<string>());
+        Assert.Equal("", kept["ipv6_host"]!.GetValue<string>()); // 空 = 手动关闭 IPv6
+
+        // 撤销手填：马上按最近一次上报的地址重新识别
+        JsonNode auto = await PatchAsync(id, new JsonObject { ["public_host_auto"] = true, ["ipv6_host_auto"] = true });
+        Assert.Equal("1.1.1.1", auto["public_host"]!.GetValue<string>());
+        Assert.Equal("2606:4700:4700::1001", auto["ipv6_host"]!.GetValue<string>());
+        Assert.True(auto["public_host_auto"]!.GetValue<bool>());
+    }
+
+    [Fact]
+    public async Task AutoDetectedAddress_StaysWhileItIsStillReported_SoReorderingDoesNotFlap()
+    {
+        await using AgentSimulator agent = await _backend.ConnectAgentAsync(hello: false);
+        string id = agent.NodeId.Value;
+        agent.Addresses = [V4, "9.9.9.9"];
+        await agent.HelloAsync();
+        await BackendFixture.EventuallyAsync(async () => (await AgentAsync(id))["public_host"]!.GetValue<string>() == V4);
+
+        agent.Addresses = ["1.0.0.1", V4];
+        await agent.HelloAsync();
+        await Task.Delay(300);
+        Assert.Equal(V4, (await AgentAsync(id))["public_host"]!.GetValue<string>());
+
+        // 原来的地址不见了才换
+        agent.Addresses = ["1.0.0.1"];
+        await agent.HelloAsync();
+        await BackendFixture.EventuallyAsync(async () => (await AgentAsync(id))["public_host"]!.GetValue<string>() == "1.0.0.1");
+    }
+}

backend/tests/MoShiro.Backend.Tests/AgentHarness.cs

@@ -49,6 +49,10 @@ public sealed class AgentHarness : IAsyncDisposable
         Result<EnrollmentResult> enrolled = await EnrollmentClient.EnrollAsync(http, backend.BaseAddress, token, name ?? backend.UniqueName("agent"), directory, AgentApp.Version, null, TimeProvider.System, CancellationToken.None);
         Assert.True(enrolled.IsSuccess, enrolled.IsSuccess ? "" : enrolled.Error.ToString());
 
+        // 测试里的 Agent 只在回环上监听：手填 public_host（手动的优先于自动识别，Agent 上报本机真实地址也不会覆盖）
+        using HttpResponseMessage patched = await backend.Admin.PatchAsync("/api/admin/agents/" + enrolled.Value.NodeId, BackendFixture.Json(new JsonObject { ["public_host"] = "127.0.0.1" }));
+        Assert.True(patched.IsSuccessStatusCode, await patched.Content.ReadAsStringAsync());
+
         var config = new AgentConfig
         {
             Fleet = { Server = backend.BaseAddress.ToString(), IdentityDir = directory },